Hope will test the new version of this universal board soon. Now it has additional inexpensive accelerometer, magnetic sensor, led, reset button, multifootprint for lora/hw/cw radio without adapter and improoved 4layers design

Hi. I use TPS61221DCKR for boards with such PIRs.

@christoph-blank Hi, thanks for using this board. In the first version of this board the divider is conected after LDO, so you can't measure voltage above 3.3V. In the second version the divider is connected to the battery directly. You use 3.2v battery so it is not problem for you. But LiFePo4 battery has very flat discharge curve so it can be hard to read this level with reasonable accuracy.

I will try to find LiFePo4 battery and add some piece of code soon. Yet you can play with followed code

  // Get the battery Voltage
  int sensorValue = analogRead(BATTERY_SENSE_PIN);
  // 1M, 470K divider across battery and using internal ADC ref of 1.1V1
  // ((1e6+470e3)/470e3)*1.1 = Vmax = 3.44 Volts
  /* The MySensors Lib uses internal ADC ref of 1.1V which means analogRead of the pin connected to 470kOhms Battery Devider reaches  
   * 1023 when voltage on the divider is around 3.44 Volts. 2.5 volts is equal to 750. 2 volts is equal to 600. 
   * RFM 69 CW works stable up to 2 volts. Assume 2.5 V is 0% and 1023 is 100% battery charge    
   * RFM 69 HCW works stable up to 2.5 volts (sometimes it can work up to 2.0V). Assume 2.5 V is 0% and 1023 is 100% battery charge  
   * 3.3V ~ 1023
   * 3.0V ~ 900
   * 2.5V ~ 750 
   * 2.0V ~ 600
   */

#ifdef  MY_IS_RFM69HW
  int batteryPcnt = (sensorValue - 750)  / 1.5;
#else
  int batteryPcnt = (sensorValue - 600)  / 3;
#endif

Hi @bjornhallberg.
I've done many tests today with your code. All tested boards were the newer ones. So I completely had no ideas until I read your last message. Now all is clear for me. You have battery draining ~10-100ua, not 1-2mA. As I see your boards contain 107J capacitors. It was an absolutely failed batch of capacitors. We resoldered all of these capacitors on all the boards after we had found this problem with @alexsh1. Unfortunatelly some of these boards had been sent until we found this problem. We are so sorry you had to deal with these failed boards. I suggest I send you some new tested buttonsized v1 boards to you. Also I can send good capacitors to rework failed boards and some of my new interesting boards for free.

@diogoc I will try to find them. But all of components are 0402...

@gerator Oh.. so sorry. It is new forum reporting system. Didn't saw your message.
A6 reads unregulated voltage (3.5-6.5V) through divider (1/3). So it can't destroyed nothing.

@jkandasa said in MySensors 2.3 and RFM69 new driver. Problems and solutions:

@mfalkvidd @Yveaux Do we have any plan to implement this changes into MySensors mainline?

We can intensively test this branch if it will appear.

@axillent I can't see the gerbers or sources of the latest board (din shape). I've seen your transformers on ali. It is perfect. I need auxiliary coil for my projects so I should place custom order on the factory.

@axillent No, I just want to look at it.

@axillent greate work ! It is very hard to order transformers... My congratulations! Can you share the pcb for the review ?